Never-married demographics in history

 I wanted to find some data about marriage statistics, possibly historical. I found these interesting data from USA, about percentage of never-married people from 1890 to 2010 (at age 35)

and at age 45:

source: https://www.census.gov/hhes/socdemo/marriage/data/acs/ElliottetalPAA2012presentation.pdf

 I even found data about Roman Census (reconstructed with modern statistics in the best way possible...)
"Demographically, the Roman Empire was an ordinary premodern state.
It had high infant mortality, a low marriage age, and high fertility within marriage.
Perhaps half of Roman subjects died by the age of 5.
Of those still alive at age 10, half would die by the age of 50.
Roman women could expect to bear on average 6 to 9 children."
source: https://en.wikipedia.org/wiki/Demography_of_the_Roman_Empire